>I cannot find data, but let's guess that it's 10 more years before 1% of households in the US have cars. That would have meant about 500,000 cars. Ford produc

>I cannot find data, but let's guess that it's 10 more years before 1% of households in the US have cars. That would have meant about 500,000 cars. Ford produced 500,000 Model T's from 1908-1914, and 500,000 in 1916 alone. While they didn't all sell in the US, with 1.3 million T's produced, it's safe to say they sold half a million cars in the US by 1916. That bumps your 40 year estimate down to 30.